JEE Main & Advanced
Physics
Electrostatics & Capacitance
Question Bank
Numerical Value Type Questions - Gauss's Law
question_answer
A thick shell with inner radius R and outer radius 3R has uniform density\[\rho \,\,c/{{m}^{3}}\]. It has a spherical cavity of radius R as shown in the figure. The electric field at the centre O of the cavity is \[\frac{a\rho R}{{{12}_{{{\varepsilon }_{0}}}}}\] then the value of a is.